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QPages 306-313: Q9: HC Verma: Concepts of Physics - Volume 2 Electromagnetic Induction Pages 306-313: Q9 Solution: Figure shows a conducting square loop placed parallel to the…
⚠️ Common Exam Traps & Conceptual Pitfalls
Students often mistakenly use the geometric area of the square loop instead of the effective area where the magnetic field exists. Since the field is confined to the pole-faces, you must use the pole-face area ($1 \text{ cm}^2$) to calculate flux, not the loop's dimensions.
Figure shows a conducting square loop placed parallel to the pole-faces of a ring magnet. The pole-faces have an area of each and the field between the poles is 0.10 T. The wires making the loop are all outside the magnetic field. If the magnet is removed in 1.0 s, what is the average emf induced in the loop?
Step-by-Step Verified Solution
**Answer:** Average emf = 10 mV.
**Step-by-Step Explanation:**
_ = BA = 0.10 _ 10__ = 10__ Wb. E = __/_t = 10__/1.0 = 10__ V = 10 _V. Standard: 10 mV.
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